Snap fastener



Jan. 9, 1940.

N. ROSOVSKY 2,186,557

SNAP FASTENER Filed Feb. 23, 1959 I" /0 W 1 /Z f INVENTOR.

A TTORNEY.

atentedJam- 4 :This mv'en an relatesto dome t snap fas teners and methods of makin'gthe 'same j FOne object of the invention is :to provide" snap fastez'i'er or'similar device having a one 5" piece 'spring carrying outwardly 'ur'ged ;tits

mounted in a casing, sopconstructed andfar ranged that the tit and sprin'gfass'embly can i be axially inserted in thecasihg for assembling, without diminishing thetension on the spring.

v v Referring in detail to the drawing,."I'0 "de- Heretoiore fasteners of this general type have been impractical-because of the large laborcost in assembling: For example, if a U-shaped strip spring be considered, I have found that it was tion, because careful handling was necess'ar'y'and' the "spring would not be reliably' gripped while necessary to insert the spring and tit assembly? angularlyinto the I dome, ':'so that one titat a handling,l especially as there is very little space in the dome. I also found that ifs-it were at-- tempted to axially insert the spring. and tit as-' I Sim FAsTE n]; v

i ew B fil N w st; my. f j 7 23,1939, Serial No. 257,867:

01.1 1411) .v v v the same structure, but, useful devices" may be produced-embodying less than the whole. 2

It will be obvious/to those skilled in the art to which the invention appertains; that the samemay be-incorporated in several Cdifierent construction s. The accompanying drawing, '--there-' ferred exemplification of the invention.

notes a device -e'mb "dy ing the invention} The fore, is. submitted merely as showing the prefsame may include 'a snap fastener *having. an

The companionfmemberor section of the snap fastener'ma'y include a tubular or'dome shaped outwardly channeled ring H 1 adapted to be se-ff cured 'to 'a member: l2 such as'fabric o'r'the like;

,l4fwhich may be inser'tedyinto and 'bentover a r 1 member l5 of fabric or the like Remotely' from ,sembly into the domegthe spring had to. be

deformed in excess of its elastic limit, so that insufiicient springtension for the tits was avail able.: 3 v

It is'therefore an object of the invention to overcome these difificulties in a simple,. practical.

structure. v

tionwill becomeapparent 'as the specification proceeds."

v With'the aforesaid objects in view, the inven', .tion consists in the novel combinations andq of Fig. 1; t U

Fig. 3 is'ari edge view of the spring and tit assembly asinitially for V Fig. 4 is a sectional iew "of the dome showing the spring and tit" assembly accordingto its second stage or shape, and in course of being inserted into the dome.v

The'advantages of the invention ashere outlined are best realized when all of its features 65 member and to permit thering to be readily Other objects and advantages of the invenv the openend 1'6 of the dome member area p1u-' rality ofholes l1 disposed along a diameter of holes are a plurality of projections or tits I8 I!) "so as v to be movableinward and outward by the ring l lpto retain the latter on ,the dome moved on, and offirom; the dome member; In

leasably secured together in the well known .--man'ner-. r

The'spring I 9' is desirably a one-piece ele- 'ment which mayconsist "of phosphor bronze .;and' is preferably in the 'form of a'strip .ofgen- 'erally U -form, Accordingly the spring l9 may .include -a pairofar'rns 20 extending parallel to the axis of the dome member and being adapted to bearfagainst the sidewall thereof Fixedly connected" to the free end portions of the arms .20 as by, riveting or in any other suita ble'manin effect mounted and held in place by means Fig.v 2 is'fa sectional view on the line 2 2. iinidiof t e dome v gh or n' the spring; This big ht portion may beara'gainst the member 15, and *may' act as a resilient secequal to 'the"--interna l diameter of the dome and instrumentalities are combined in one and member I 2.

portion 2 I [I provide relatively sharp bends I 22.

this manner'the' members l2 and limay be re- 1 At the junctions of the am 2:: with the bight,

j the dome member Slidably mounted in these '7 0 1 ner are the tit-portions I8.- Thus the spring is I y Y These may be vconsidered toform approximate Y i right'angles, although, desirably the angles are smaller for a reason that will presently appear. Centrally of the bight portion and intermediate of the junctions 22 is a bend 23 which. extends inward of the dome member or in the general direction of the free ends of the arms 28!. It will v be noted that the angle formed at this bend 23 is a relatively large obtuse angle. This bend at 23 need not be sharp,-but may have curvature. In a general sense, it may be stated that the bight portion 2! is in flattened conditionin contradistinction to a'curved form such as that suggested in Fig. 4.

The method of making and assembling the tit and spring unit with the dome member 12 will" now be described. First the spring member is: u made. in the form of a planeblanki -l towhich the tits 18 are secured as shown in Fig. 3." Then the blank 24 is bent into a U-shape form so asto provide the arms 20 and the bends 22, with w the arms 29 being approximately parallel to each other. Now the arms 2i are pressed toward each other by a suitable tool and the spring and tit unit axially inserted into the dome member I2, with the tits [8 riding along the internal face of the cylindrical section i3, and finally snapping into the holes ll.- Now the bend 23 is formed by centrally applying to the bight portion of the spring a strain in excess of the elastic limit, thus causing the spring to assurne the shape shown in Fig. l. The assembly is now complete. I

,It will be notedthatdue to the. length of the tits %3, the defcrmationrequired in the. spring would be sufiioiently great to exceed the elastic limit at the b ight portion so that the spring would exert insufficient outward force upon the. tits;

This drawbackisobviated by the present invention. By inwardly convexing the bight portion of the spring, the tension thereon is increased so that the spring can powerfully urge the tits outward. The particular advantage in forming rangement and construction such that the spring exerts a maximum degree of force upon the tits for reliably retaining the ring ll.

"I claim:

l. A snap fastener member including a tubular memberv having holes extending along a diameter, tits slidably mounted in said holes, and a spring p of generally U-shape in said member extending lengthwise thereof, said spring having the free end portions of its arms aflixed to the'tits to outwardly resiliently urgethe same, said spring having a bight portion having approximately right anglebend connections with the arms and having a generally central obtuse angle bend toward the free ends of the arms, and the length of the bight portion being approximately equal to the internal diameter of the tube. a

2. A device including a snap fastener section having a casing, outwardly movable projections mounted in. holes in the casing, and ail-shaped spring, the projections being permanently mounted on the spring arms adjacent to their. free ends, and said spring having a portion intermediate-of its arms bent in the direction of the free ends of the arms, whereby the spring and its projections can beassembled with the casing by an axial movement and the intermediate band formed after assembly to tension the spring.

NATHAN nosovsKY.v 

